I have recently bought a few RedSea LED 90's and got the aluminium universal mounts to go with them, but have noticed that they keep 'sagging' and angling downwards. I have attached a couple of photos. I thought it was because the screw needed to be tighter, but when I tried to tighten it, I split the spacer in half... twice. Has anyone else had a similar issue or have a solution? Feels awful to purchase these mounts and they can't even stay upright.